1021001012 has 6 divisors (see below), whose sum is σ = 1786751778. Its totient is φ = 510500504.

The previous prime is 1021000963. The next prime is 1021001029. The reversal of 1021001012 is 2101001201.

It can be written as a sum of positive squares in only one way, i.e., 821739556 + 199261456 = 28666^2 + 14116^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127625123 + ... + 127625130.

It is an arithmetic number, because the mean of its divisors is an integer number (297791963).

Almost surely, 2^1021001012 is an apocalyptic number.

It is an amenable number.

1021001012 is a deficient number, since it is larger than the sum of its proper divisors (765750766).

1021001012 is a wasteful number, since it uses less digits than its factorization.

1021001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255250257 (or 255250255 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1021001012 is about 31953.1064530509. The cubic root of 1021001012 is about 1006.9518964763.

Adding to 1021001012 its reverse (2101001201), we get a palindrome (3122002213).

The spelling of 1021001012 in words is "one billion, twenty-one million, one thousand, twelve".